10% is the change from 840 to 924
Calculation steps:
[( 924 - 840 ) ÷ 840] x 100 = 10%
Formula
Percentage change = [(924 - 840) / 840] x 100
Subtract the new number by the original number
924 - 840 = 84
84 ÷ 840 = 0.1
0.1 x 100 = 10%
Example